dont cover just keep out of direct sun light, if hes burrowed hes coverd himself, just leave alone, feed n water, he will find a comforable spot for himself. Rule of thumb is if you dont see him that often hes comfortable, if hes out a lot especialy in day light there is something wrong
ok i have put him on the shelf and he is burrowed away not seen him since i put him in his tank so all must be good, ill have a little look later to see if he has moved thanks for all of this i cant wait to get yours now i have the tank already!! im well in to all this its great!!